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PLC的外部設備主要是指控制系統(tǒng)中的輸入輸出設備，其中輸人設備是對系統(tǒng)發(fā)出各種控制信號的主令電器，在編寫控制程序時必須注意外部輸入設備使用的是常開還是常閉觸點，并以此為基礎進行程序編制。否則易出現(xiàn)控制錯誤。
在PLC內(nèi)部存儲器中有于輸入狀態(tài)存儲的輸入繼電器區(qū)，各輸入設備（開關、按鈕、行程開關或傳感器信號）的狀態(tài)經(jīng)由輸入接口電路存儲在該區(qū)域內(nèi)，每個輸入繼電器可存儲一個輸入設備狀態(tài)。PLC中使用的"繼電器"并非實體繼電器，而是"軟繼電器"，可提供無數(shù)個常開、常閉觸點用于編程。每個"軟繼電器"僅對應PLC存儲單元中的一位（bit），該位狀態(tài)為"1"，表示該"軟繼電器線圈"通電，則程序中所有該繼電器的觸點都動作。輸入繼電器作為PLC接收外部主令信號的器件，通過接線與外部輸入設備相，其"線圈"狀態(tài)只能由外部輸入信號驅(qū)動。
鄭娟萍
廈門仲鑫航自動化設備有限公司
PLC的各種功能主要是通過運行控制程序來實現(xiàn)。編制程序時，需要合理使用PLC提供的編程元件（即軟元件）。FPO型PLC中常用的編程元件有兩種：位元件（bit）和字元件（word）。位元件實際上是PLC內(nèi)存區(qū)域所提供的一個二進制位單元，又被稱為軟繼電器，主要用作基本順序指令的編程元件，如輸入繼電器Xn、輸出繼電器Yn、內(nèi)部通用繼電器Rn、定時（計數(shù)）器等，其參與控制的方式主要是通過對應觸點的通斷狀態(tài)改變影響邏輯運算結(jié)果即輸出。
字元件則為PLC內(nèi)存區(qū)域內(nèi)的一個字單元（16bit），主要用作功能指令和高級指令的編程元件，通常用以存放數(shù)據(jù)，如數(shù)據(jù)寄存器DTn，定時(計數(shù))器的設定值SVn、經(jīng)過值EVn等。字元件沒有觸點，通常以整體內(nèi)容參與控制。
ABB Jumper Bar 016852005 2 Pole 2P Lot of 10 New
NEW KILLARK GRAY CEILING MOUNT ENCLOSURE BOX NV2XGWW NV2XG
New New no name Diode AA126 8919 AA-126 89-19
NEW KILLARK GECLBT-2 2-WAY CONDUIT OUTLET ENCLOSURE BODY 3/4" NPT GECLBT2
NAMCO SmartCAM Programmer 13561 Used
NEW GRACO AIR & PILOT VALVE REPAIR KIT 220-656 220656
MITSUBISHI BATTERY CASE MODULE PLC CARD MR-BT6VCASE
Fafnir 4-Bolt Flange Bearing RCJ 1-3/8 RCJ138 1-3/8" Bore w. Collar New
IPC POWER RESISTORS RESISTOR 93-02 93 02 9302 10218 DRAWING 30 OHMS
Spirax Sarco Main Valve Assemlby 2" 50MM FT20 FT43 FT44 FT46 FT47 2" FT40 10 Bar
Sylvania 100M-G214 Pilot Light 100MG214 120Vac 23Vdc
NEW ALLEN BRADLEY AB PRESSURE SWITCH 830 A2-210 830A221
Merlin Light Curtain Transmitter M1148-TX M1148TX 48" L Used
TRIAD CONTROLS LIGHT CURTAIN TRANSMITTER TR-30-2F-20 TR-30-2F-20 TR302F20
SIEMENS SITOP POWER 30 6EP1437-1SL01 6EP1437 1SL01
BESTA POWER 8670 0106 LOT OF 5 AIR PNEUMATIC TROLLEY
Gordos Output Module OAC5Q E46203 LR28595 4-8 VDC 140 VDC 3 A Amp Lot of 2 Used
Eurotherm 2408 Temperature Controller 2408/CC/VH/D4/T2/XX/RF/XX/XX/ENG 240VAC
MOTOROLA TRANSCEIVER RADIO AZ492FT5775 F2099B MPKB
3) NEW FESTO ELECTRIC 4PIN PLUG CONNECTOR 18 666 18666
BRYANT JHUN364 200A 200 A AMP 600V NON FUSED UNFUSED SAFETY DISCONNECT SWITCH
PARKER PS1-E2301F PS1E2301F 120VAC 1.6A SOLENOID OPERATOR PLUG-IN NEW
New Pepperl + Fuchs Proximity Sensor NJ5-11-N NJ5-11-A
Rodix Feeder Cube All Purpose Vibratory Feeder Control FC30 120 VAC Used
Electric Supply Inc Stater with Condenser FS-4C FS4C 30-40 Watt Lot of 6 New
Martin 1 B 52 SDS V-Belt Sheave 1B52SDS Max RPM 4774 New
MITSUBISHI RECTIFIER POWER MODULE RM15TA-2H F3007E
NO NAME ALUMINUM HEAT SINK 8-1/2"x 5-3/16"x 1-1/2"
AMPHENOL 97-3057-6 9730576 CABLE CLAMP NEW
MIKAB 20501-1 I/O KORT 637441 Card Board Control
NEW LEESONA BRUSHES 709-724-14 70972414 "LOT OF 10"
MIKAB 20501-1 I/O KORT 637442 Card Board Control
Siemens-Allis 18-723-775-001 I8-723-775-001
RELIANCE ELEC RECTIFIER STACK 086466060-V 086466060V911
Stanley BU406D-R 1-Digit Counter BU406DR 7A28A1
KILLARD XECD-304A2 CIRCUIT BREAKER ENCLOSURE HAZARDOUS LOCATIONS EXPLOSION PROOF
WIELAND BAMBERG WEB 1001 99.823.5257.0 MODULE W/ RELAYS
NEW DOCKWEILER BLIND CAP GASKET 064512 S61870 12.70MM 12.70 MM 1/2" .5"
Badger Control Valve Actuator EVA-1XBA-0 1002GCN36SV0EALN36 115 Volt Used
BALDOR RELIANCE M3111 34F779-0255 .75 HP 3/4 HP 230/460V 3450 RPM MOTOR NIB
NEW IFM EFECTOR100 IFC204 INDUCTIVE SENSOR IFB3004BBPKG/M/US-104-DPS
Tedea Huntleigh Load Cell Model 1250 Used
NEW LOT OF 2 CUTLER HAMMER TOGGLE SWITCH 8438 3 AMP A 3A 250 VDC
Lot of 4 New SPC Technology Jack Box 52N9496
ALTECH CONTA CLIP TERMINAL AP1/TS AP1TS
NEW SIEMENS 3SE2 120-8GW00 POSITION SWITCH 3SE21208GW00
edyne Farris 187-0 Pressure Relief Valve 1870 3/4"
DVT Smart Image Sensor series 700 Model 720 720-9PRR2
ELTEX OF SWEDEN 31.9094.001 319094001 31.0869.0037 3108690037 NEW
EDI EBERLE DESIGN TRAFFIC LIGHT CONTROL CONFLICT MONITOR NSM-3L NSM3L
ALLEN BRADLEY TRANSDUCER 105061 100ACT
S Clamp KA100 KA 100 New stainless s/s
RAYMOND 154-002-040 RELAY 154002040
Zenith Controls Timing Control FR-15S FR15S NEW
NEW RITTAL BUSBAR CONNECTION ADAPTOR SV 9342.310 800 AMP A 800A 690V
Crouzet Mounting Board PB-24C4 57-433/E PB24C457433E Used
NEW NO NAME GLASS FLOW THRU FLANGE VIAL BEAKER 42292-00 4229200
New Sybron Taylor Pen Arm Lifter Lot of 3 79P332
KRP Power Source KL 6208
PARKER PMC-6270 PMC6270 HYDRAULIC MOTION CONTROLLER
IFM Efector 100 IF5333 IFA3004-APKG Proximity Switch IF5333IFA3004APKG New
Mercoid Control Pressure Switch PPQW-3-X3A 2&3R 240V
SPREAGUE CLORINOL CAPACITOR 200P440GK091P56 40-440AC
LIN-ACT FP409200 P1LN025 DYN73.000W NN9S 6 5/16" - 9 3/16" PNEUMATIC CYLINDER
REDIC 12 94 V127 W650 127V 650W HEATING ELEMENT 22 1/4"
ESI AUTO CENTERING CENTER COMP BOARD B82008
Intec PMT Control II 7010160 Rev F Used
SQUARE D J250S 250A 250 A AMP SERIES A01 INDOOR BREAKER ENCLOSURE NEW
NEW NORTON DOOR CLOSER 7700 PTD 8000 PTD 24V
NEW TOSHIBA 50U6P43 POWER MODULE
In Dual Core Processor QOXQ HH80556KJ0534M Lot of 3 Used
DATA TECHNOLOGY OPTECON ENCODER OC25-125-50/5-62B 0C25-
Cutler Hammer Eaton D100A Controller D100CRA40A Series A1 Used
NEW CRAMER MOTOR TIMER 55F3148 115Vac 1/20 RPM 10071
Gefen VGALR Extender Sender 5 VDC w. Cable & Power Cord Used
MIKAB 864701-2 4 CH X 12 BIT D/A KORT 632018 Card Board
Phoenix Contact Test Plug PS-UK2.5B/Z-6 PSUK25BZ6 New
ABB Entretec BFM SUM.D9M-ANA Module 021 056 13 02105613 Used
(3) FERRAZ SHAWMUT ULTRASAFE FUSE HOLDER L214462 USM1I 600 VOLT 30A 30 AMP A
edyne Hastings Mass Flow Monel Transducer HS-10KM HS10KM 3/4" NPT New
AMPHENOL 97-67-14-6 9767146 CABLE CLAMP NEW
COPELAND SENSOR PROBE 085-0109-00 085010900 NEW
YASKAWA AC SERVO MOTOR SGMP-02AWYR11 200V VOLT 2.0A A AMP 200W WATT
MAGNETROL INTERNATIONAL CONTROL CONTROLLER 09-5109-001 095109001 REV 3 .
Sunao Calendar-Timer ET-200S0 ET-200SC 200 Volt Used
NEW emecanique R.B Dension Mini-Switch MS01S01-00
Honeywell Parallel PLOM Link Module 620-0086 6200086 w. Key Used
Intec Corp Discriminator Model 0201 7010052 SCH Rev K Used
PARKER FILTRATION FILTER ELEMENT G02076 10B GC G0207610BGC
FISHER ROSEMOUNT INLIGENT DEVICE INTERFACE CL6923X1-A1 12P0425X142
IRCON MODLINE PLUS INFRARED THERMOMETER 3-02C05-0-1-0-00-0/622 302C05010000
Bosch BEN 11.95x56x52.2 1823 120 021 1823120021 BEN 11 95 56 52.2 New
New 9 Phoenix Contact DIK1,5LA DIK 1,5-LA 15A 28-14 AWG
No Name Spacer Pin 12-07-19-001 /04 921371 BB123047-T
BARBER COLMAN TS5301 TS-5301 SENSOR 1000 OHM NEW
Lot of 25 IMO Chain Offset Links #25 New
Lot of 25 IMO Chain Offset Links #25 New
EMERALD COMPUTERS CIRCUIT BOARD ASBD-FPAT-01
SKF Tapered Roller Bearing 32026X New
SIEMENS BUSBAR 3RV1915-2AB 3RV19152AB 63A 63 A AMP 690V
DATATFORTH LDM422 ISOLATED CONVERTER LDM422-P LDM422P USED
National Electronics Electronic Electron Vacuum Tube OB2WA 7 PIN New in Box
Symbol Tech Hand Held Scanner M2004-1200 Cyclone
NEW LOT OF 2 NO NAME ROD CLEVIS KIT L071300200
NEW EAGLE FEMALE RECEPTACLE 30 AMP A 30A 125/250V
NEW PARKER FILTER ELEMENT 923013 74W YK 92301374WYK
Brentek G-WDT5 Watchdog Timer Relay G-WDT5-T0-01 GWDT5T001 New
NEW GE GENERAL ELECTRIC THERMOSTAT C283-R C283R 70-250°F
Reliance Surge Suppressor 600686-24RR Used
Acme Power Supply DR 120245 DR120245 93/120/132 VAC 24 VDC New
NEW BARKSDALE TEMPERATURE SWITCH L2H-H351 L2HH351
NEW NO NAME NIP ROLL FOR LABELER
Midwest 1SC10110101T Coil 100:0.1 W/ Circuit Board 5020
FURNAS FORWARD REVERSE SWITCH TT3 120V
FOXBORO 821GM-IS1NH2-M DIFFERENTIAL PRESSURE TRANSMITTER MWP 600 PSI
BANNER AMPLIFIER MODULE CM5A 250Vac .75A A A AMP 4VA 4 VA 11 PINS
STI LIGHT CURTAIN CONTROLLER BOARD 17990-0010C 43816-0011-B 43816-0010 MC4-0110
NEW NO NAME TENSION PIN ASSEMBLY 41-3-21 SIZE SZ 3 41321 5/8"ID 2-23/32"L
FIREYE Solid State Burner Management Ser D 70D10
Cramer Hour Counter Type 117 117JH200-L0010A-668-R 220V
GENERAL SC3-12-865 SC3-12-865B 865 A.H 24V 24 VOLT 3PH L-A BATTERY CHARGER
LOT OF 2 LEGRAND FUSE HOLDER 214 01 21401 10 X 38 10X38 - USED
NAIS Expansion Unit FP1-E14 FP1E14 AFP13314 110/120V 30/250V 2-5 Amp Used
MPE Inc Phase Monitor 002-440-123U 002440123U 10 A Amps @ 240 V Volt VAC New
TAWD-M TAKEMOTO KEY PAD DM CIRCUIT BOARD 1407A
Topring 60.357 Airpro Blow Gun 60357 New
(2) No Name Nylon Strain Relief Fitting CD16NA-BK-N-0
TAWD-M TAKEMOTO KEY PAD KEYPAD CIRCUIT BOARD NO. 1334B
NEW 28 STRIP (280 SHOT) REMINGTON STRIP LOAD 78758 S27C4 .27 CALIBER 4 YELLOW
Diamond Chain link A.N.S.I. C-332344-16/46-2-P C2080H B2CL2H
ILAN POWER ADAPTER SUPPLY 12V-19V 1.4A AC-D01 ACD01
Load Controls Controller PCR-1810V PCR1810V 120 V Volt VAC Used
New Honeywell Aux Potentiometer Q181A 1015 Q181A1015
Barber Colman Thermocouple P012-33300-23604-39 BS28H13A 5-3/4" X 30' New
ASHCROFT PRESSURE SWITCH APSNSDCS05 60PSI NEW
EMCO POWER SUPPLY CIRCUIT BOARD 115-0003-002A 1150003002A
FISHER SCIENTIFIC COMPANY ACCUMET MINI PH METER 640A
New Joy Compressor Part 300100 300 100
NEW THOMAS & BETTS T&B 2" 90° CONDUIT FITTING LT9200P TYPE B
Hoffman Electric Enclosure Cover Seal Z-06043LP 6-3/4"
New In Box KTR Clampex locking assembly KTR 400 KTR400 45x75
Veeder-Root Veeder Root G616362-001 Panel Mount Kit G616362001 New
Tyco Elcon PD20-1 Terminal Board PD201 PD20-I New
NEW MILLER SEAL 052-PS017-150 052PS017150 2PK
New ARO Manual Valve 5030-02 1/8" NPT Port 3/8" NPT
MOELLER PKZM 1-6 MOTOR PROTECTOR 4,0-6,0A SER 02
JAMESTOWN FUME HOOD FACE VELOCITY ALARM 1011-221-0032 1011210032 NIB
2 Hoffman Electric Enclosure Cover Seal Z-04043LP 4-1/2
ELECTRO SWITCH ELECTROSWITCH AMMETER SWITCH 2410C SER 24 3 PHASE 3 PH
ROSEMOUNT PT-501212B TRANSMITTER W/ ANDERSON M4AVS
GOMI ELECTRIC TRANSFORMER TF-4161A 160.3 VA 160.3VA NT-987 TF4161A
JOHNSON CONTROLS P74DA-15 DIFFERENTIAL PRESSURE CONTROL P74DA15 New
CHROMALOX EMERSON RADIANT HEATING HEATER ELEMENT 57-1/2" RTU-5253A 480V 2500W
TCI 3PH Line Reactor KLR360ACB 600V 60Hz 360A WO Cover
DYNISCO PRESSURE SWITCH TPT432A-10M-3/18 10,000PSIG NEW
NEW FLEXOLAP REID BRASS BLIND HOLE LAP BARREL CYLINDER 4-FB-13 4FB13 5/8-11/16
Cutler Hammer E57CAL30A2 Proximity Sensor E57C AL30A2
CHROMALOX 308247 TEMPERATURE CONTROLLER KNOB NIB
NIMBUS LAMINAR LAMARFLO CLEAN AIR CLEANROOM FILTER FILTRATION 53040-A 53040 240V
(BOX 10) RADION 60MB 60 MB MINIATURE LAMP NEW
NEW EATON MCF ACTUATOR BEARING REPLACEMENT KIT 40189-EN 40149 EPDM
NEW BALLUFF PHOTOELECTRIC SENSOR 130001 BLE 18KW-NA-1PP-C-02 BLE18KWNA199C02
NEW TURCK Bi15-Q20-ADZ32X2-B3131 SENSOR 20-250VAC Bi15Q20ADZ32X2B3131
MILBANK WIREWAY ENCLOSURE BOX 4412-GSC1 12 X 4 X 4 NEW
SSI Southern Systems Inc. Sensor IM5101 35mm nf 10-36V
NEW WARNER BRAKE CLUTCH ROTOR ACCESSORY 5104-751-034 5104751034
GARDNER-DENVER COOPER ARCNET BRIDGE A-IB A-1B 960393
ATI ANALYTICAL TECHNOLOGY MONITOR MODULE IN ENCLOSURE
NEW LOT OF 10 RADION MINIATURE LAMP LIGHT BULB 7349 6.3 VOLT
Mitsubishi MELSEC-Q CPU Unit Q00CPU 5 VDC 0.25 A Amp Used
RIFA Elyt Long Life Capacitor PEH 169PO515VM PEH169PO515VM Used
New Taylor Instruments Chart Knob 70S18
Sunstrand PCM Relay SFHL 420/575 SFHL420575 Used
MITSUBISHI MELSEC INPUT MODULE CIRCUIT BOARD AX41
Mosier Norgreen QM4507 Shaft Seal Kit QM-4507 New
2) ALLEN BRADLEY BUCHANAN WIRING ARM 1771-WH 1771WH
NEW SQUARE D 9998 QA-82 CONTACT KIT 9998QA82
Ohmite Mounting Hardware Kit 7PA200 New
RELIANCE ELECTRIC VOLTAGE RELAY CONTACT KIT K-51 K51
NEW SENTROL INDUSTRIAL INTERLOCK PROXIMITY SWITCH SENSOR 115-6Y-12K 1156Y12K
CUSTOM CONTROL SENSORS 610V1 DUAL-SNAP PRESSURE SWITCH 500PSIG
NEW SUN ENGINEERING PHOTOMULTIPLIER TUBE 330434 330012 1D8363
BANNER TOWER STACK LIGHT TL50HBGYRAQ 10-30V 100mA
TOLEDO DIGITAL SCALE HEAD DISPLAY PANEL 8132 A117939 F10860700A F10860700 A
Ogden Ceramic Heater Band CB1861-2 CB18612 600W 230V 4.25" ID 3" SCRTERMBOX New
Ashcroft Dial Thermometer C-600A-04-C03-B01-A1-L01 4-1/2" 20-240oF 5' L New
Square D 8501 RS4 NR45 8501RS4 8501NR45 Relay Socket
NEW DMC PILOT LIGHT BODY RB2 BVL74 RB2BVL74 110V AC/DC RB2-BVL
FUJI ELECTRIC TRANSISTOR A50L-2001-0232 6RI30FE-080 30A
NEW LOT OF 5 NO NAME MOTOR BRUSH SIE-111 1"L 1/2"W 1/4"TH
NEW MERKEL OMEGAT OMS-MR-140 0-6 3 MT28/276 15.452/95 B0153-179.239
AMCI 1931 Inligent Resolver Interface Module NEW
